<template>
     <!-- htlm -->
    <div class="app">
        <h3>
            你好呀~！123
        </h3>
    </div>
</template>

<script lang="ts">
//js或者ts
export default{
    name:'App' //组件名
}

</script>

<style scoped>
/* 样式 */
    .app{
        background-color: aqua;
        box-shadow: 0 0 10px;
        border-radius: 10px;
        padding: 20px;

    }

</style>